From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
Change to obtain the fdt use case as reported in the
adi,ad3552r.yaml file in this patchset.
The DAC device is defined as a child node of the backend.
Registering the child fdt node as a platform devices.
Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
---
drivers/iio/dac/adi-axi-dac.c | 62 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index a4147231cd57..c0d965560546 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
+#include <linux/platform_data/ad3552r-hs.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
@@ -107,6 +108,8 @@ struct axi_dac_info {
struct axi_dac_state {
struct regmap *regmap;
struct device *dev;
+ /* Target DAC platform device */
+ struct platform_device *dac_pdev;
/*
* lock to protect multiple accesses to the device registers and global
* data/variables.
@@ -750,6 +753,45 @@ static int axi_dac_bus_reg_read(struct iio_backend *back, u32 reg, u32 *val,
return regmap_read(st->regmap, AXI_DAC_CUSTOM_RD_REG, val);
}
+static void axi_dac_child_remove(void *data)
+{
+ struct axi_dac_state *st = data;
+
+ if (st->dac_pdev)
+ platform_device_unregister(st->dac_pdev);
+}
+
+static int axi_dac_create_platform_device(struct axi_dac_state *st,
+ struct fwnode_handle *child)
+{
+ struct ad3552r_hs_platform_data pdata = {
+ .bus_reg_read = axi_dac_bus_reg_read,
+ .bus_reg_write = axi_dac_bus_reg_write,
+ };
+ struct platform_device_info pi = {
+ .parent = st->dev,
+ .name = fwnode_get_name(child),
+ .id = PLATFORM_DEVID_AUTO,
+ .fwnode = child,
+ .data = &pdata,
+ .size_data = sizeof(pdata),
+ };
+ struct platform_device *pdev;
+ int ret;
+
+ pdev = platform_device_register_full(&pi);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ ret = devm_add_action_or_reset(st->dev, axi_dac_child_remove, st);
+ if (ret)
+ return ret;
+
+ st->dac_pdev = pdev;
+
+ return 0;
+}
+
static const struct iio_backend_ops axi_dac_generic_ops = {
.enable = axi_dac_enable,
.disable = axi_dac_disable,
@@ -874,6 +916,26 @@ static int axi_dac_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, ret,
"failed to register iio backend\n");
+ if (st->info->bus_controller) {
+ device_for_each_child_node_scoped(&pdev->dev, child) {
+ int val;
+
+ /* Processing only reg 0 node */
+ ret = fwnode_property_read_u32(child, "reg", &val);
+ if (ret || val != 0)
+ continue;
+
+ ret = fwnode_property_read_u32(child, "io-backends",
+ &val);
+ if (ret)
+ continue;
+
+ ret = axi_dac_create_platform_device(st, child);
+ if (ret)
+ continue;
+ }
+ }
+
dev_info(&pdev->dev, "AXI DAC IP core (%d.%.2d.%c) probed\n",
ADI_AXI_PCORE_VER_MAJOR(ver),
ADI_AXI_PCORE_VER_MINOR(ver),
--
2.45.0.rc1
